题目内容
Every possible means ____, but none ____ successful.
A.has tried; has proved | B.tried; proves |
C.has been tried; proves | D.is being tried; is proved |
C
解析
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题目内容
Every possible means ____, but none ____ successful.
A.has tried; has proved | B.tried; proves |
C.has been tried; proves | D.is being tried; is proved |
C
解析